28969918 has 8 divisors (see below), whose sum is σ = 43628760. Its totient is φ = 14427000.

The previous prime is 28969909. The next prime is 28969933. The reversal of 28969918 is 81996982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28969918² = 1678512297853448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28353 + ... + 29356.

It is an arithmetic number, because the mean of its divisors is an integer number (5453595).

Almost surely, 2^28969918 is an apocalyptic number.

28969918 is a deficient number, since it is larger than the sum of its proper divisors (14658842).

28969918 is a wasteful number, since it uses less digits than its factorization.

28969918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57962.

The product of its digits is 559872, while the sum is 52.

The square root of 28969918 is about 5382.3710388638. The cubic root of 28969918 is about 307.1254142815.

It can be divided in two parts, 289 and 69918, that added together give a palindrome (70207).

The spelling of 28969918 in words is "twenty-eight million, nine hundred sixty-nine thousand, nine hundred eighteen".